A comprehensive analysis in six volumes of the factors that have significantly influenced the outcomes of 600 major battles of modern history, commencing with the Netherlands' War of Independence and the Thirty Years' War, and continuing through the 1973 Arab-Israeli War. Volume I includes the summary and introductory materials. Volumes II-VI present matrices and narrative summaries for the engagements, which are grouped chronologically by wars and campaigns within wars. The matrices summarize all important elements of data and qualitative information concerning each engagement, plus a historical assessment of the factors that were important to the course of the engagement and its outcome. Following each group of matrices are narrative summaries of engagements listed in the matrices. These narrative summaries succintly describe the background, course, and outcome of each engagement, include a brief assessment of its significance, and list the sources consulted with respect to the presentation for each. Appended to each volume are bibliographies listing the major sources consulted during the research for each.